// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ui/views/widget/desktop_aura/desktop_screen_position_client.h"

#include "ui/views/widget/desktop_aura/desktop_native_widget_aura.h"

namespace views {

namespace {

    // Returns true if bounds passed to window in SetBounds should be treated as
    // though they are in screen coordinates.
    bool PositionWindowInScreenCoordinates(aura::Window* window)
    {
        if (window->type() == ui::wm::WINDOW_TYPE_POPUP)
            return true;

        Widget* widget = Widget::GetWidgetForNativeView(window);
        return widget && widget->is_top_level();
    }

} // namespace

DesktopScreenPositionClient::DesktopScreenPositionClient(
    aura::Window* root_window)
    : wm::DefaultScreenPositionClient()
    , root_window_(root_window)
{
    aura::client::SetScreenPositionClient(root_window_, this);
}

DesktopScreenPositionClient::~DesktopScreenPositionClient()
{
    aura::client::SetScreenPositionClient(root_window_, NULL);
}

void DesktopScreenPositionClient::SetBounds(aura::Window* window,
    const gfx::Rect& bounds,
    const gfx::Display& display)
{
    // TODO(jam): Use the 3rd parameter, |display|.
    aura::Window* root = window->GetRootWindow();

    // This method assumes that |window| does not have an associated
    // DesktopNativeWidgetAura.
    internal::NativeWidgetPrivate* desktop_native_widget = DesktopNativeWidgetAura::ForWindow(root);
    DCHECK(!desktop_native_widget || desktop_native_widget->GetNativeView() != window);

    if (PositionWindowInScreenCoordinates(window)) {
        // The caller expects windows we consider "embedded" to be placed in the
        // screen coordinate system. So we need to offset the root window's
        // position (which is in screen coordinates) from these bounds.

        gfx::Point origin = bounds.origin();
        aura::Window::ConvertPointToTarget(window->parent(), root, &origin);

        gfx::Point host_origin = GetOriginInScreen(root);
        origin.Offset(-host_origin.x(), -host_origin.y());
        window->SetBounds(gfx::Rect(origin, bounds.size()));
        return;
    }

    window->SetBounds(bounds);
}

} // namespace views
